Table 2. Background disease status of naïve and PSD affected (Trojan) fish used in cohabitation experiments.

Severity of puffy skin lesions rated as mild, moderate and severe. Number of positive fish given in percentage (n = 10 per group).

Trial	Fish group	Puffy Skin	Bacteriology	Virology	Parasites
1	Trojan (Site A)	20% mild to moderate	Shewanella-like (2/10)	-ve	-ve
	Naïve (in house reared)	-ve	-ve	-ve	-ve
2	Trojan (Site A)	60% mild to moderate	Shewanella-like (3/10)	-ve	-ve
	Trojan (Site B)	60% severe, 40% moderate	Aeromonas salmonicida (1/10)	-ve	-ve
	Naïve (Site C)	-ve	-ve	IPNV (1/10)	-ve